package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.nio.Buffer;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;


    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void save(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入一条数据
        dishMapper.insert(dish);

        //返回主键id
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(s -> s.setDishId(dishId));

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 条件查询接菜品
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        //分页定义格式化
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> dishVO = dishMapper.selectAll(dishPageQueryDTO);

        return new PageResult(dishVO.getTotal(), dishVO.getResult());

    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Override
    public void delete(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);

            dishFlavorMapper.deleteByDishId(id);
        }
    }


    /**
     * 查询指定字段
     *
     * @param id
     * @return
     */
    @Override
    public DishVO selectById(Long id) {
        //查询菜单
        Dish dish = dishMapper.getById(id);

        //查询口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getById(id);


        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;

    }

    /**
     * 修改菜品
     *
     * @param dishDTO
     */
    @Override
    public void update(DishDTO dishDTO) {
        //修改菜品表基本信息
        dishMapper.update(dishDTO);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /**
     * 根据id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish build = Dish.builder().status(StatusConstant.ENABLE).categoryId(categoryId).build();
        List<Dish> list = dishMapper.list(build);
        return list;
    }



    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
